Hawaiian Islands Satellite Interpretation Message
Tue, 14 Sep 2010 13:30:00 -0500
Based on data through 1800 UTC September 14 2010.
Scattered to broken high clouds are moving over the islands of Kauai and Oahu from the southwest this morning, while scattered to broken low clouds are over windward coasts and adjacent waters. Large scale view of the tropical central Pacific shows broken low clouds from about 18°N to 24°N from the longitude of the islands to 140°W, with only few low clouds located between 24°N and 30°N between 165°W and 140°W.
Trade winds continue to dominate the low level flow over the islands, and low cloud and showers coverage has increased somewhat over windward waters, as compared to recent days. The greatest coverage of low clouds this morning is over windward Big Island and adjacent waters, where broken to overcast stratocumulus /sc/, with embedded showery cumulus /cu/, are over the Puna, Hilo and Hamakua slopes, and extend up to 60 miles to the east. The leeward side of the Big Island is mostly sunny this morning, as is the case in Maui county as well. Leeward sides of Kauai and Oahu are mostly free of low cloud cover, but high clouds streaming over these islands from the southwest are making for milky skies. The windward side of Maui is under broken cu and sc, as is the extreme eastern tip of Molokai. Meanwhile, Lanai and Kahoolawe are mostly sunny. Only few to scattered cu are seen near Oahu, and over the lower slopes of Kauai, but the interior portions of Kauai have broken cu. Low clouds near the islands are moving toward the west, at speeds near 21 mph.
Water vapor imagery reveals a closed low aloft centered about 700 miles northwest of Kauai, near 26°N 171°W, with a northeast to souhtwest oriented trough associated with the low along a line from 30°N 165°W to the low center to 18°N 180. The low has been drifting slowly toward the west-southwest over the past 6 to 10 hours. Scattered thunderstorms are near the core of the low, within 120 miles either side of a line from 26°N 167°W to 21°N 175°W. The high clouds moving over Kauai and Oahu are associated with the low and trough, with some of this high level moisture originating from the tops of isolated thunderstorms located about 650 miles southwest of the islands.
Thunderstorm coverage within the near equatorial trade wind convergence zone south of the islands is at a minima, with only isolated thunderstorms from 07°N to 20°N between 140°W and 145°W.
BIRCHARD
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